Method of processing radiographic image data for detecting a welding defect
US5182775A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 11, 1991 |
| Grant date | Jan 26, 1993 |
| Priority date | — |
| Expiry date | Jan 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/912
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radiographic test is conducted on a welded portion of a pipe or the like to form a radiographic image, which is introduced into a computer. Volumetric defects and planar defects in the radiographic image are emphasized and extracted by separate methods to obtain a volumetric candidate defect image and a planar candidate defect image. The candidate defect images are then combined to form a single image in which defects can be easily identified. Features of defects in the images are measured, and a set of interference rules is applied to the measured features. Each inference rule gives a degree of certainty that a defect is of a certain type. The degrees of certainty determined by a plurality of the rules are collated to obtain a total degree of certainty, and the type of a defect is inferred from the total degree of certainty.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.